Google may soon put advertisements in Gmail based on data strings found in the latest version of Gmail for Android. AndroidPolice examined the code of the latest app and discovered that several references to Ads, ranging from a new directory to store data to codes that mention how users will interact with ads, appear in Gmail. Ads will be presented in multiple ways and some may be saved or dismissed depending on how the user responds to them.

Advertisements already appear in the web version of Gmail, so it's no surprise that they would eventually find their way to the Gmail Android app. After all, Google is a company built on the strategy of releasing a popular service that reaches mass appeal and then supporting the venture through ads. There's no telling when ads will start appearing in Gmail based on the code, but the Android 4.6 version of the app makes it a near certainty that it's coming.

A few other features are also in the pipeline for Gmail Android users. The app will soon warn users about Unsent messages that are still in the draft folder. This will help remind users about messages awaiting being sent or failed to send because of connectivity issues. Gmail also changes the notification drawer for messages from people with no picture ID. Rather than show a blank box, it shows the first letter of the person's name.